patch 8.0.1361: some users don't want to diff with hidden buffers
Problem: Some users don't want to diff with hidden buffers.
Solution: Add the "hiddenoff" item to 'diffopt'. (Alisue, closes #2394)
diff --git a/src/buffer.c b/src/buffer.c
index dad9103..ed5773e 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -593,6 +593,11 @@
if (buf->b_nwindows > 0)
--buf->b_nwindows;
+#ifdef FEAT_DIFF
+ if (diffopt_hiddenoff() && !unload_buf && buf->b_nwindows == 0)
+ diff_buf_delete(buf); /* Clear 'diff' for hidden buffer. */
+#endif
+
/* Return when a window is displaying the buffer or when it's not
* unloaded. */
if (buf->b_nwindows > 0 || !unload_buf)